dev #73297 : delete feature file of a digital resource migration

FEATURES/73297

-        '73297' =>
-            ['Label' => $this->_('Assimil : Migration de tous les clients vers V2'),
-             'Desc' => '',
-             'Image' => '',
-             'Video' => '',
-             'Category' => '',
-             'Right' => function($feature_description, $user) {return true;},
-             'Wiki' => '',
-             'Test' => '',
-             'Date' => '2018-05-23'],
\ No newline at end of file